The national survey, released this week, showed that just under 20 percent of high school students said they were recent users of e-cigarettes and other vaping products.

Just 5 percent of middle school students said they had recently used them.

The earlier survey found nearly 28 percent of high school students and 11 percent of middle school students had recently vaped.

They were asked about the use of any vaping or tobacco products during the past month.

While the number of students smoking cigarettes has reached all-time lows in recent years, the use of vaping products has exploded.

And federal law now bans sales of all tobacco products and e-cigarettes to anyone under age 21.

Public health experts have wondered if last year’s sudden increase in vaping related illnesses may have caused some students to give up vaping.

Matt Myers of the Campaign for Tobacco Free Kids said in a statement the survey showed a “meaningful drop” in teen vaping.

The policy did not cover disposable e-cigarettes, which saw a big increase in this year’s survey.